AT&T brought effectively a similar lawsuit against (Unix derivative) BSD in 1993 and lost.
Quote:
SCO paid big bucks for Unix long before Linux existed.
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http://www.robotwisdom.com/linux/timeline.html
1991, Sep: linux 0.01
1992: Jan: Linux 0.12 = 0.9
1992: 22 Jan: 1st Linux FAQ
1993: Novell buys "Unix" (USL = Unix Systems Labs) from AT&T (for $332M)
1995: SCO buys "Unix" from Novell (for 6.1M shares of SCO stock) (street val. $100M I've heard)
2000: Aug: Caldera acquires (parts of) SCO
http://www.linux.org/news/sco/timeline.html
2000, Dec: The part of SCO not purchased by Caldera is renamed Tarantella
2002 Aug: Caldera changes name to SCO Group. They state that they are going to concentrate on their Unix development.
http://www.dvorak.org/scotimeline/
2003 Jan: SCO claims they want to find out if there is SCO intellectual property in Windows, Mac OS X, Linux and versions of BSD. McBride
singles out Mac OS X:
If you pull down (Mac) OS X you'll see a lot of copyright postings that point back to Unix Systems Laboratories, which is what we hold."
2003: Caldera/SCO announces the filing of $1B lawsuit against IBM